HEAD revision of a remote subversion repository

I've been dreaming of the day svn info will take a repository URL instead of working from a WC. In the meantime, I've
found a cool trick that solves my problem:

$> export URL=http://svn.apache.org/repos/asf/
$> svn log -q -rHEAD $URL \
| head -2 \
| tail -1 \
| awk {'print $1'} \
| sed -e's/r//'

151745

And voila, you can tell the latest revision from a remote repository.